History

Xenor Krell tried to steal the Ultragem but she only managed it thanks to Amy Rose and Tekno the Canary, whom she duped into believing that she needed it for the common good. Xenor Krell used the Ultragem to defeat Serpentus, then transformed the castle into solid silver. When she turned on Amy Rose, the silver castle reflected the Ultragem’s rays and both Xenor and the gem were reduced to vapor.[1][2]